You can say what you want as far as never won anything of significance, but the big 8 had 3 really good teams in the middle 90's. Nebraska, Colorado, and KSU were top 10 fixtures for about 5 years straight. In 95 the big 8 had four teams finish in the top 10 when you add in KU. Most of us don't think about those teams being all that good, becuase NU kicked their ars pretty bad most years, but they were really good teams.
1992 - Nebraska #11, Colorado #13, Kansas #22
1993 - Nebraska #2, Colorado #20, Oklahoma #17, Kansas State #20
1994 - Nebraska #1, Colorado #3, Kansas State #19
1995 - Nebraska #1, Colorado #7, Kansas State #7, Kansas #10
1996 - Colorado #5, Nebraska #6, Kansas State #17
1997 - Nebraska #1/2, Texas A&M #14, Kansas State #17
Your statement is close but incorrect. Colorado was the closest with three top 10 seasons and two more top 20, while the other schools only had one top ten season each in that timeframe.